High intensity, plasma-induced emission from large area ZnO nanorod array cathodes

Abstract

High intensity electron emission cathodes based on a well-aligned ZnO nanorod array were fabricated. An investigation of the properties of the plasma and the electron beams produced by ZnO nanorod array cathodes was presented. Intense current electron beams were obtained from the cathodes. At an electric field of 7–8V∕μm and pulse duration of ∼100ns, the highest emission current density reached 76–91A∕cm2. The production mechanism of the electron beams was the plasma-induced emission. The morphology and structure of the ZnO nanorod after the application of the accelerating pulses were characterized. The plasma expanded at a velocity of about 10.7cm∕μs during the pulse interval. Whether the emission currents are high or low, the plasma on the cathode surface were always distributed uniformly. The ZnO nanorod array cathodes are expected to be applied to high power vacuum electronic devices as electron beam sources.

Improved glucose electrochemical biosensor by appropriate immobilization of nano-ZnO

“…Fig. 4(b) represents CV curves with different scan rates (20,40,60,80 and 100 mV/s) in 3 mM glucose for the kinetic and transport characteristics of GO x /ZnO electrode. It can be found that the oxidation peak potential for H 2 O 2 shifts positively with the increase of scan rates, suggesting a kinetic control over the redox at the active sites of the GO x /ZnO electrode [21].…”

“…ZnO nanorods were synthesized by the hydrothermal decomposition method on Si substrates in a large scale. The reaction solution was prepared by mixing proper quantity of 0.05 M Zn(NO 3 ) 2 and methenamine ((CH 2 ) 6 N 4 ) solutions in a Teflon-lined autoclave [20]. The desirable reaction conditions are 95 • C and 7 h. The white colored powder collected from Si wafers, wetted by 0.01 M phosphate buffer solution (PBS) with pH 7.4, were coated onto the surface of a Au electrode, and then dried after being compacted [10].…”

Study on the Electron Emission Properties of ZnO Nanorod Arrays on Different Substrates

“…the application in the plasma-flashover cathodes due to their excellent field emission properties. [3][4][5][6][7][8] Unfortunately, the electron emission properties of ZnO-NAs under the pulse electric field were rarely investigated. Therefore, the studies on the field emission properties of ZnO-NAs are very important under both the pulse electric fields and the DC electric fields.…”

“…[1][2][3][4][5][6][7][8] Field emission properties of 1D nanomaterials has been extensively studied because of its importance in the fundamental and high technology applications. [3][4][5][6] Among them, 1D ZnO nanostructures have been widely investigated as electron emitters, because they have high thermal stability in harsh environments, high aspect ratio and high curvature at the tip.…”

“…Especially, the highly oriented ZnO nanorod arrays (ZnONAs) are always very important field emission materials and research focus. [3][4][5][6][7][8] A great deal of intensive research interests are driven by the enormous applications using ZnO-NAs as field emission materials. In the previous field emission studies, ZnO-NAs mainly were applied to weak current devices under direct current (DC) electric field.…”